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Entry  Tue Mar 2 19:52:46 2021, gautam, Update, LSC, REFL55 demod board rework 
    Reply  Wed Mar 3 22:13:05 2021, gautam, Update, LSC, REFL55 demod board rework 
       Reply  Thu Mar 4 23:16:08 2021, Koji, Update, LSC, REFL55 demod board rework D990511-00_REFL55.pdfP_20210304_215602.jpgP_20210304_222400.jpgP_20210304_222412.jpg20210304234400_IMG_0526.jpg
          Reply  Fri Mar 5 13:53:57 2021, gautam, Update, LSC, REFL55 demod board rework 
             Reply  Fri Mar 5 15:31:23 2021, Koji, Update, LSC, REFL55 demod board rework 
                Reply  Fri Mar 5 16:24:24 2021, gautam, Update, LSC, REFL55 demod board re-installed in 1Y2 REFL55.pdfdemodNoise.pdf
                   Reply  Fri Mar 5 22:25:13 2021, gautam, Update, LSC, PRMI 1f SB locking recovered PRMI1f_noArmssensMat.pdf
Message ID: 15864     Entry time: Thu Mar 4 23:16:08 2021     In reply to: 15859     Reply to this: 15867
Author: Koji 
Type: Update 
Category: LSC 
Subject: REFL55 demod board rework 

A new hybrid splitter (DQS-10-100) was installed. As the amplification of the final stage is sufficient for the input level of 3dBm, I have bypassed the input amplification (Attachment 1). One of the mixer was desoldered to check the power level. With a 1dB ATTN, the output of the last ERA-5 was +17.8dBm (Attachment 2). (The mixer was resoldered.)

With LO3dBm. RF0dBm, and delta_f = 30Hz, the output Vpp of 340mV and the phase difference is 88.93deg. (Attachment 3/4, the traces were averaged)

Attachment 1: D990511-00_REFL55.pdf  1.450 MB  | Hide | Hide all | Show all
D990511-00_REFL55.pdf
Attachment 2: P_20210304_215602.jpg  2.292 MB  | Hide | Hide all | Show all
P_20210304_215602.jpg
Attachment 3: P_20210304_222400.jpg  966 kB  | Show | Hide all | Show all
Attachment 4: P_20210304_222412.jpg  1.374 MB  | Show | Hide all | Show all
Attachment 5: 20210304234400_IMG_0526.jpg  408 kB  | Hide | Hide all | Show all
20210304234400_IMG_0526.jpg
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